There is a saying in Zi Yi Ba Zheng that the vernal equinox has arrived: What does an egg mean when it arrives in Liaoyi?

It refers to the vernal equinox, which is very popular among China people.

The vernal equinox, one of the twenty-four solar terms, was also called "day-to-day" and "day-to-night equinox" in ancient times, and the sun reached the longitude of the Yellow River. In order to welcome the spring equinox, people have many customs. Every spring equinox, tens of millions of people all over the world are doing "vertical egg" experiments. According to historical records, the tradition of laying eggs at the vernal equinox originated in China 4000 years ago to celebrate the arrival of spring. The saying that "the vernal equinox is here and the eggs are beautiful" has been passed down to this day. On this day, many places in China will hold egg laying competitions, and this China custom has already spread abroad and become a "world game".